Convex cutting method and apparatus



1213.31, 1933. A. M. REMINGTON 1,895,819

CONVEX CUTTING METHOD AND APPARATUS Filed Nov. 28, 1927 Patented Jan. 31, 1933 UNITED] STATES PATENTOFFICE i ALFRED :nr nnmme'ro v, or FITCHBURG, MAssAonusriT'rs,"AssreivoR 'ro snrrolvns s'Aw & STEEL 00., or FITCHBURG, MASSACHUSETTS, A CORPORATION or AssAoHpsE'r'rs 'CONVEX CUTTING METHOD AND APPARATUS Application filed November 28, 1927. Serial No. 236,315.

This invention relates to convexly cutting a strip ofstock and more particularly to the method of providing aconvex surface on one side of such a strip and to-the apparatus for carrying out such a method.

In the manufacture of blades, especially blades made of thin strips of steel, it is often desired to provide on one side of the'strip a convex surface-and particularly to'provide such ,a surfaceby a transverse cutting operation whereby the cutting marks are crosswise.

The primary object of this invention is to cut stripsof metal so that the lateral portions ,of. one side are convex in contour. A further 7 object of this invention-is to remove the cor- 1 which may be operated-by the wheel 15.

ners of one side of theistrip along each edge so. that the lateral portions of the side are convex in contour, such removal being the result of transverse cuttlng as the strip passes the cutting wheel.

For the purpose ofsetting forth more clear ly this invention, one embodiment is illus- .trated in the accompanying drawing. in

which: V I y ,Fig. 1 is a side elevation of a ,machine-;by which this invention may be carried out; V Fig. 2 is a plan view partly in section of the machine shown in Fig. 1; l V Fig. 3 is a transverse section on an enlarged vention; and Fig. 4 is an enlar ed perspective view 'settin forth one step in thecajrrying out of the invention. y

In the drawing is shown a cutting wheel 10 of thecup type suitably mounted upon a standard 11 and adapted ;to berotated in the direction of the arrow'12' by any suitable means, which arenot shown in detail since they form no part of the present invention. Mounted uponthe pedestal 11 in front'of the grinding wheelilOis shown a platform 14- Whichcan'be advanced or retracted relative to the cuttingwheel 10 by any known. means scale of a stripiof metal embodying this in- Fixed upon the platform 14 are a pair of suitably spaced sectional guide plates 16 and 17 between which a strip of metal: 18, which isto be treated in accordance-with this'inven- 27. As shown, particularly in Fig. 2, sections 17 and then fed-outwardly from the interior thin, is consequently flexible and accordingly path defined by tain ed by setting the rollers 22, 23 atthat p0- Y .sition in the interior 30 (of the wheeljwhich tion, is fed by a pair of suitably formed rollers 19 and 20 which may be driven by means of a motor 21. A second pair of rollers 22 and p 23 mounted betweensections of the guide plates 16. and 17 engage the sides of the strip. These rollers are also positively driven by any suitable means. V 1 1 The wheel 10. has. an annular'cutti'ng face 25 having anouter edge 26 and aninneredge of the. guide plate 17 arespaced at 28 to'permit the wheel to come into contact with one1surface of the strip 18. A backing plate 291s mountedopposite the space 28 between sec '5 tions of the guide plate 16to support that portionof the strip which is acted upon bythe wheel .10. 1 The strip of metal 18, when introduced into the machine, is preferably rec'- tangular in cross section, as shownin Fig. 3 by thedotted lines. i 1

Referring to Fig. 4, it will be noted that the'strip .18 is fedinto the interior 30 of the grinding'wheel being hel'dout 'of contact with the cuttingrface 25 by the guide plate coming" into contactlwiththe inner edge 27 of thecutting face 25 at an acute angle thereto,so:that the wheel 10first contacts with the side edge of th'e strip.- -A s the strip 18 passes thewheel lO, lateral portions 31 beginning at each edge are removed, leaving one side of thestrip convex in contour as shown'in Fig. 3. The metalstrip operated upon, being can be fe'diwithout difliculty in. the curved f the guide plates 16, 17, as shown-in Fig. 2. Y i V Obviously, by changing the angle at'which the strip 18' contacts with the cutting face 25, the amount of' convexity of the lateral portions 31 can be regulated and, furthermore,

' the width of'such portions can be controlled so that the entire surface of one side is not convexed. Thisadjustment is preferably atwill' cause the strip 18 to be fed at thede sired angle and byshifting the guide plates 16,11

and the backing plate 29 accordingly.

-.-In view, of the ifact that the-wheel 10' is 4 rotated upon an axis substantially at right,

i acutting wheelof the cup type but it will be angles to the forward end of the strip of metal, it must follow that the cutting is performed transversely and that the cutting marks on the lateral port-ions will be crosswise. The drawing and description set forth understood that in place of the cup wheel, a .cylinderwheel or a saucer wheel might be employed. The essential feature is that the surface bywhich the cutting'is performed must be concave in order to give a convex contour to the surface and hence any cutting wheel having a concave cutting face can be employed in carrying out this invention.

a As'described and shown the strip'18 contacts With the cutting face 25 on its movement out of the interior of the'wheel. Thedirection'of movement couldbe reversed if desired or the strip brought into contact I with" the cutting face twice without departing from StIlP IlDtO and out of the interior of said 'wheel and, duringsuch feeding movement,

bringing the; corners of one side of said strip into contact with the concave inner edge of I the cutting faceat an acute angle thereto j-tions ofone side of the strip convex in conmoved. Y 2. The method of whereby the corners will be transversely retreating aflexible strip of stock by-"a grinding wheel having an annular'cuttingface to form the lateralportour, consisting in flexing and feeding the strip'into and'out of the interior of said .wheel and, as; the strip leaves the interior,

moved; 1 I

3. f Apparatus for cutting a flexible strip of bringing the corners of'one side of the-strip into contact with the concave inneredge of the "cutting face at an acute angle thereto whereby the corners will be transversely restock to form lateral portionson one side of convex contour comprising a cutter revolving about an axis of rotation and having an annular cuttingface, guidingmeans for flexing the stock within the annular: cutting face, and means for feeding the stock outwardly along a curved path into engagement-with the inner edge of'the cutting face obliquely to theaxiswhereby the corners of'one side will be removedby a transverse cutting operation.' i

4. Apparatus for cutting a flexiblestripiof stock toformlateral portions on 'one side of convex contour comprising a cutter revolving aboutxan'a xis rotation and having an annular cutting face, guidingmeans for flexing the stock within the cutter between the annular cutting face thereof, and means for feeding the stock outwardly along a curved path through the plane of the cutting face and outwardly into engagement with the inner edge of the cutting face obliquely .to the axis whereby the corners of one side'will be removed by atransverse cutting operation and means for adjustingthe relationof the guiding and feeding means relative to the cutter for determining the extent of thecutting operation. P

5. The method of grinding a flexible strip of stock on a grinding Wheel having an annular face forming an inner concave grinding edge, which comprises advancing the strip successively across the annular face at two fixed points spaced circumferentially thereof, f

holding the strip out-of contact with the 7 wheel as the strippasses the-first of these points, flexing the strip as'it' passes between these two points to cause the strip to advance from within the wheel at an acute angle to s the plane of, the annular face thereof, and

guiding the strip as it passesthe second of said points to cause the strip to intersect the path of rotation of the inner concave grinding edge formed by said annular face,

"whereby at least one of the longitudinal edges of the strip maybe ground by engagement with said inner concave grinding edge; V 6. The method of grinding a flexible strip of stock on a grinding wheel having an annular face forming an inner concave grinding edge, which comprises advancing the" strip successively across substantially opposite portions of the"a nnular face, maintaining the strip out of contact with the wheel as the strip passes the first of the substantially opposite portions of the annular face, flexing the strip-longitudinally as it'passes between the, latter portions of the annular face to cause the strip to intersect the path of rotation of the inner concave grinding'edge at an acute angle to the plane of the: annular face, 1

whereby the longitudinal edges of'thefstrip maybe ground by engagement with this inner c'oncavegrinding edge.

7 Q The combination with a grinding wheel having an annular face, forming an inner concave cutting edge, of ,means'for advancing a flexible stripof stock through an arcuate path extending within the-wheel and intersect-ing the plane of'the annular face at two points, the first of these points being located" to maintain the'strip of stock outof contact with the wheeland the :seco'ndof the points being located tocause stock emerging fr'om within the wh'eelto engage the innerconcave cutting edge thereof so that at least one of the longitudinaledges of the strip of stock maybe ground by this concave cutting edge as the stock passes. from the wheeL;

r 8. The combinationwith-a gr'inding'wheelhaving an annular face forming'an inner con cave cutting edge, of means for advancinga flexible strip of stock through an arcuate path extending within the wheel and intersecting the plane of the annular face at two points disposed substantially on a diameterthereof, the first of'these points being located to maintain the strip of stockout of contact with the wheel and the second of the points being located to cause stock emerging from within the wheel to engage the inner concave cutting edge thereof so that at least one of the longitudinal edges of the strip of stock may be ground by this concave cuttingedge as the stock passes from the wheel.

9. Apparatus of the class described comprising a grinding wheel having its central portion cut away to form an inner concave cutting edge su stantially concentric about the axis of rotation of the wheel, means for feeding stock transversely across difierent portions of the cutting edge in succession, means for flexing the stock convexly toward the axis of the wheel as it passes between these different portions of the cutting edge thereof, means for maintaining the stock out of contact with the wheel where the stock first passes the cutting edge, and meansfor guiding the stock to cause the latter to engage the cutting edge at an acute angle to the axis of rotation of the wheel as the stock emerges from the cut-away central portion thereof, so that at least one of the longitudinal edges of the stock may be ground con vexly and the marks produced by the grinding may extend transversely of the stock.

10. Apparatus of the classdescribed comprim'ng a grinding wheel having its central portion cut away to form an inner concave cutting edge substantially concentric about the axis of rotation-of the wheel, fixed guide members spaced to define an arcuate path leading into the cut-away central portion of the wheel and out across the concave cutting edge thereof, an inner guide member being broken away where the path crosses the concave cutting edge so that stock may be ground convexly by this edge as it passes thereby, and means for advancing stock through the arcuate path. a

11. Apparatus of the class described comprising a grinding wheel having its central portion cut away to form an inner concave cutting edge substantially concentric about the axis of rotation of the wheel, fixed guide members spaced to define an arcuate path leading into the cut-away central portion of the wheel and out across the concave cutting edge thereof, an inner guide member being prising a grinding wheel having its central portion cut away to form an inner concave cutting edge substantially concentric about the axis of rotation of the wheel, fixed guide members spaced to define an arcuatexpath leading into the cutaway"central portion of broken away where the path crosses the con- 7 cave cutting edge so that stock may be ground convexly by this edge as it passes thereby, and substantially parallel feed rollers' disposed on opposite sides of the path for advancing stock'therethrough.

12. Apparatus of the class described com- 

